Spark-plug.



w. H. MAKUTCHAN.

SPARK PLUG.

APPLICATIDN FILED APR. 19. I918.

Patented Feb. 11, 191% amoemtoz Wm H. naxurcnm, or CHICAGO, ILLINOIS.

SPARK-PLUG.

Specification. of Letters Patent.

Patented Feb. 11', 1919.

Application filed April 19, 1918. Serial No. 229,551.

To all whom it may concern:

Be it known that I, WILLIAM H. MAKUT- CHAN, a citizen of the United States, residing at Chicago, in the county'of Cook and State of Illinois, have invented a new and useful Spark-Plug, of which the following is a specification.

The device forming the subject matter of this application is a spark plug, and one object of the invention is to provide a structure 'of this kind which will be simple in construction, the chance of the plug becoming out of order being extremely remote, and the construction being such that the plug will not be likely to be put out of commission, even in the hands of an inexperienced operator. v

. The invention aims to improve the mounting of the electrodes and to improve generally and to enhance the utility of devices of that kind to which the present invention appertains.

In the accompan drawings Figure 1 shows in slde elevation, a spark plug constructed in accordance with the invent1on;

Fig. 2 is a longitudinal section of the plug, wherein parts appear in elevation;

And Fig. 3 is a perspective of the support which carries one electrode.

In carrying out the invention, there is provided a body 1, preferably made of metal, including a wrench head 2 and a reduced extension 3 which is externally threaded as shown at 4, so that the body may be assembled with the cylinder of an internal combustion engine; The body 1 is provided with an enlarged axial passage 5. Superposed on the upper end of the body 1 is a disk 6 which is made of insulating material. A support 7 is mounted on the disk 6 and includes a foot plate 8 and a reduced neck 9, the foot plate being in immediate contact with the insulating disk 6. Openings 10 are fashioned in the foot plate 8 of the support. Insulating washers 11 are supported on the foot plate 8 and metal washers 12 are supported on the insulating washers 11. Securin devices 14, which may be screws, pass ownwardly through the washers 12 and 11 and through the opening 10 in the foot plate 8 of the support 7 the securing devices passing through the insulating disk 6 and enga g the upper end portion of the body 1. i lie heads 15 of the securing devices 14 cooperate with the washers 12, and in this connection it is to be observed that the diameter of the openings 10 in the foot plate 8 are relatively large, compared with the diameter of the securing devices 14. Consequently, the securing devices 14 do not come into contact with the foot plate 8, and there is no danger of a short-circuit at this point. An electrode 16 in the form of a rod, is carried by the support 7 and extends downwardly through the axial passage 5 of the body 1 in spaced relation with the body, the electrode rod passing through the insulating disk 16. An electrode 17 is mounted in thelower end of the part 3 of the body 1 and cooperates with the electrode 16.

The invention comprises a connector 18, preferably in the form of a resilient metal plate, having elongated slots 19 defining and strips 20 and an Intermediate stri 21, the plate 18 having an opening 22, a apted to receive a conductor (not shown). he upper end of the electrode 16 may be inserted through the slot 19, the end strips 20 and the intermediate strip 21 upon the other hand binding upon the electrode 16. The construction is such that the connector may be mounted readily and with equal facility be removed. 7

The spark plug forming the subject matter of this application is simple in construction and includes but few parts, having no loose elements, and practically nothing about the device which is likely to get out of order even though the structure be submitted to somewhat rough usage, or be manipulated by those unaccustomed to the handling of electrical devices. The plug may be fashioned at trifling expense, and the parts thereof are so shaped that any of them may be renewed without difiiculty and at small cost.

- Having thus described the invention, what is claimed is:

A spark plug comprisin a body having a passage; a support including a foot plate and a reduced neck, thefoot plate having an opening; insulatingmaterial between the body and the foot plate; a securing device insulated from' the foot plate and passing through the opening, in spaced relation with the wall of the opening, the securing device engaging the body; and an electrode car- 5 ried by the neck and extended into the passage. I

n testimony that I claim the foregoing as my own, I have hereto aflixed my signature in the presence of two witnesses.

WILLIAM H. MAKUTCHAN.

Witnesses J. H. STRAcK, EIJZABETH H. JUNG. 

